1. When 20cm^3 of a gaseous Allene burns in an excess of oxygen, 60cm^3 of carbon dioxide are formed. Both volumes are measures at r.t.p.
What is the formula of alkene?
Is it C3H6 or C6H12 and why?

2. A student investigate the reaction of vegetable oil with hydrogen.
100cm^3 of hydrogen was bubbled through 1g samples of four different vegetable oils containing a suitable catalyst. The volume of hydrogen remaining after each experiment was recorded.